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Answer Wiki. The ionic charge of oxygen is -2. You can tell because oxygen is in group number 6, so it has 6 valence electrons. Since it needs 2 more electrons to become neutral with a full outer shell of 8 electrons, its charge is -2 (since adding electrons gives a negative charge).
For example, a water molecule is made. up of two hydrogen atoms bonded to one oxygen atom. The oxygen atom attracts electrons more strongly than. the hydrogen atoms do. Thus, the electrons spend more. time near the oxygen atom. This gives each hydrogen. atom a partial positive charge (D+) and the oxygen atom a. partial negative charge (Dâ). Molecules that have partially charged positive and.